Separation device for rolling mills



Oct. 10, 1950 Filed April 10, 1946 FIG. 1-

A. FJKRITSCHER SEPARATION DEVICE FOR ROLLING mus 4 Sheets-Sheet 1 Oct. 10, 1950 A. F. KRITSCHER SEPARATION DEVICE 'FOR ROLLING IIILLS 4 Sheets- Sheet Filed April 10, 1946 mwfi mm f 15w W E E 0 m% m w Oct. 10, 1950 A. F. KRITSCHER 2,525,587

SEPARATION DEVICE FOR ROLLING HILLS Filed April 10, 1946 4 Sheets-Sheet 4 IZZTIII ?&

05M 9. Ada? Patented Oct. 10, 1950 SEPARATION DEVICE FOR ROLLING MILLS Andrew F. Kritsclier, Ellwood City, Pa., assignor toNational Tube Company, a corporation of New Jersey Application April 10, 1946, Serial No. 660,922

2 Claims. 1

This invention relates to a. separation device for a rolling mill and more particularly to such a device for use with the upper roll of a tube rolling mill. In rolling tubes in a plug mill the upper roll is raised to permit the workpiece to be stripped oif the bar and returned to the enterin side of the mill after each pass over the plug. Prior to my invention, this was accomplished by withdrawing a wedge which was located between the top chock and the mill screw, thus permitting the roll counterbalance to raise the roll. After the workpiece was returned to the entering side of the mill, the wedge was moved back into position between the chock and mill screw by means of an air cylinder, thus forcing the roll down into rolling position. Due to the shock load and the resilient nature of the operating medium, it is difficult to hold the wedge accurately in place, thus causing gage variations in the workpiece.

It is an object of my invention to provide a roll separation device which does not have any wedge contact surfaces during the rolling operation.

This and other objects will be more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is a front elevation, partly in crosssection, of my separation device in place on a roll stand;

Figure 2 is a side elevation taken in the direction of arrow 2 in Figure 1;

Figure 3 is an enlarged sectional view showing the separation device in retracted position;

Figure 4 is a view similar to Figure 3, but showing the separation device in operative position;

Figure 5 is a side elevation of the top guide;

Figure 6 is a side elevation of the bottom guide;

Figure 7 is a sectional view taken on the line VII-VII of Figure 3;

Figure 8 is a sectional view taken on the line VIII-VIII of Figure 4;

Figure 9 is a plan view ofthe carriage of in device; and

Figure 10 is a side elevation of the carriage of Figure 9.

Referring more particularly to the drawings the reference numeral 2 indicates the housing of a rolling mill having spaced apart openings therein. Each of the openings has a nut 6 secured therein for, receiving a screw 8. The bottom of the screw 8 rests in a, bearing II], this providing the usual screwdown mechanism. The top roll [2 of the rolling mill is journalled in spaced apart bearings I4 which are carried by the spaced apart top chucks I6, which in turn are mounted for sliding vertical movement in the housing 2. The bottom roll I8 is mounted in the bottom chocks 20. each of which is provided with a pair of cylinders 22. Fastened to each of the top chocks I6 are a pair of pistons 24 which extend downwardly into the cylinders 22. Fluid introduced through conduit 26 into the bottom of the cylinders 22 hold the top roll [2 against the pressure of the screwdown, thus acting as a counterbalance for the roll. The mechanism so far described is that commonly used in plug mills.

Between the screwdown and top chock l6 at each end of the roll are located interlocking guides 28 and 30. The top guide 28 has an opening 32 at the top thereof which fits over the bottom of bearin l0 and is secured thereto in any suitable manner. Flanges 34 extend downwardly from the main portion of the guide 28. A guiding surface 35 which is normal to the axis of the screw 8 is located between the flanges 34. Portions of the flanges 34 extend downwardly into openings 38 between spaced apart flanges 39 of the bottom guide 30 which is fastened to the top surface or the chock IS in any suitable manner. The bottom guide at has a central portion 40 which is parallel to the top guiding surface 36. A portion 42 merges with the portion 40 and slopes away therefrom to a substantially horizontal portion 44. A second sloping portion 46 merges with the parallel portion 40 on the outer side thereof and slopes away toward the chock It at an angle less than that of portion 42. A third sloping portion 48, which is parallel to the sloping portion 42 is provided on the outer end of the lower guide 30 and merges with a sloping portion 41 parallel to portion 46.

Connected carriages 50 are provided for reciprocating movement in the guides 28 and 30. Each of the carriages 50 consists of two side bars 52 which are fastened together and held in spaced apart relationship by separators: 54, 55 and 58. Pins 50 extend between bars 52 and rotatably support two pairs of rollers 62 and 64. The distance between rollers '62 and 84 is equal to the distance between corresponding portions of sloping portions 42 and 48. The bars 52 are provided with openings 66 adjacent the rollers 62 for receiving lugs 68 of a sliding block 10. The separators 58 have a bolt extension 12 thereon which are connected by means of an adjustable member 14. One of the separators 54 has an extension 55 thereon which is received between the bifurcations E6 of a crosshead 18 and is fastened thereto by means of th pin 88. The crosshead i8 is fastened to a piston rod 82 of a piston 84 by means of a pin 85. The piston 84 is slidably received in the cylinder 88.

The operation of the device is as follows:

When it is desired to withdraw the carriages 50 from between the guides 28 and 30, fluid is introduced into the right end of cylinder 88. This moves the carriage from the position shown in Figure 4 to the position shown in Figure 3 with the rollers 62 passing from surface 46 over portion 40 to the bottom of portion 42. At the same time rollers 64 move to the bottom of portion 48. This moves the sliding block It from between the parallel portions of the guides 28 and 38 to a position inwardly of the guides, thus providing space which permits the fiuid in cylinders 22 to raise the upper chock After the workpiece is returned to the mill entrance, fluid is introduced to the left end of cylinder 88 to move the carriage outwardl to the position shown in Figure 4. In this movement the rollers 62 and 64 ride upwardly on surfaces 42 and 48, respectively, forcing the top roll it downwardly into working position. Continued movement carries the rollers 62 over the surface 4G to the sloping surface 4'6, in which position the sliding block 10 is located between the parallel surfaces of the top and bottom guides 28 and 30. The height of block i is slightly less than the overall height of the rollers 62 and 64. so that it does not contact the guides until the rollers pass down the inclined surfaces 46 and H. As the rollers 62 and 64 pass down the inclined surfaces 46 and 41 the load is removed from the rollers and taken by the block 10. In some instances the rollers 62 and 64 may be omitted, in which case there will be sliding contact between the guide and carriage instead of rolling contact. From the foregoing it is seen that the pressure is applied to the roll l2 through surfaces which are normal to the direction of the pressure so that the roll is held accurately in place.

While one embodiment of my invention has been shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

I claim:

1. A roll adjustment device for use between the roll screwdown and roll chock of a rolling mill which device comprises spaced apart guide surfaces between the screwdown and chock, a portion on one of said guide surfaces being normal to the axis of the screwdown, a portion on the other of said guide surfaces being parallel to the said portion of the first guide surface, a portion on said second guide surface merging with the said parallel portion and sloping away from the first guide surface, a second sloping portion merging with the said parallel portion on the side thereof opposite the first sloping portion and extending away from the first guide surface, a carriage mounted for movement between said guide surfaces, a pair of rollers mounted on said carriage, a block mounted on said carriage adjacent the rollers, the height of the block being slightly less than the overall height of the pair of rollers, and means for reciprocating said carriage between said guide surfaces whereby the pair of rollers moves from the remote part of the first sloping portion to the second sloping portion in which position the block rests between the parallel portions of the guide surfaces.

2. A roll adjustment device for use between the roll' screwdown and roll chock of a rolling mill which device comprises spaced apart guide surfaces between the screwdown and chock, a portion on one of said guide surfaces being normal to the axis of the screwdown, a portion on the other of said guide surfaces being parallel to the said portion of the first guide surface, a portion on said second guide surface merging with the said parallel portion and sloping away from the first guide surface, a second sloping portion merging with the said parallel portion on the side thereof opposite the first sloping portion and extending away from the first guide surface, a third sloping portion parallel to the first sloping portion on the outer end of the last named guide surface, a carriage mounted for movement between said guide surfaces, spaced apart pairs of rollers mounted on said carriage, the distance between the rotating axes of said pairs of rollers being equal to the distance between corresponding points on the first and third sloping portions of the guide surface, a block mounted on the inner end of said carriage, the height of the block being slightly less than the overall height of each pair of rollers, and means for reciprocating said carriage between said guide surfaces whereby the inner pair of rollers move from the remote part of the first sloping portion to the second sloping portion in which position the ;block rests between the parallel portions of theguide surfaces.

ANDREW F. KRI'ISCHER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

